Which of the following statements is true about modem?

A.
It amplifies the digital signals.

B.
It converts digital signals into analog signals and vice versa.

C.
It reduces the noise in analog signal.

D.
It converts AC current to DC current and vice versa.

Explanation:

Modem converts digital signals into analog signals and vice versa. Modem is a device used by
computers to communicate over long distances through Public Service Telephone Lines (PSTN).
Modem stands for Modulator and Demodulator. When a computer sends data, it uses digital signals.
Modem converts these digital signals into analog signals and transmits the data over PSTN. At the
receiving end, modem converts the analog signals back to digital signals and delivers to the receiving
computer.